[docs] update license headers to 2026

[odow]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.37%. Comparing base (69c3bb7) to head (ae53143).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #887      +/-   ##
==========================================
+ Coverage   96.35%   96.37%   +0.02%     
==========================================
  Files          28       28              
  Lines        4032     4032              
==========================================
+ Hits         3885     3886       +1     
+ Misses        147      146       -1     

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